JP4661518B2 - Dissimilar material joint structure - Google Patents

Description

  The present invention relates to a dissimilar material joining structure, and more particularly to a dissimilar material joining structure that joins members formed of dissimilar metals having a natural potential difference.

As this kind of dissimilar material joining structure, the following is known (for example, refer to Patent Document 1). For example, Patent Document 1 discloses an example of a bonding structure in which a reinforcing material formed from a second metal having a higher natural potential than the first metal is bonded to the surface of a base material formed from the first metal. . In the joint structure described in Patent Document 1, the reinforcing material is covered with a coating film and the end portion is bent upward from the surface of the base material so that the edge portion of the end portion is slightly lifted from the surface of the base material. ing.
JP-A-5-44066 (FIG. 1)

  However, as in the example described in Patent Document 1, the reinforcing material is merely bent by bending the end portion side of the reinforcing material above the surface of the base material and slightly lifting the edge portion of the end portion of the reinforcing material from the base material surface. If the reinforcing material is a base metal material with a high ionization tendency with respect to the base material, electrolytic corrosion occurs at the end of the reinforcing material. There is a fear. Moreover, when water accumulates between the edge part of the edge part of a reinforcing material, and the base-material surface, there exists a possibility that an electric corrosion may generate | occur | produce in the junction part of a base material and a reinforcing material.

  The present invention has been made in view of the above circumstances, and an object thereof is to dissimilar materials that can prevent the occurrence of electrolytic corrosion in a dissimilar material joining structure that joins members formed of dissimilar metals having a natural potential difference. It is in providing a material joining structure.

In order to solve the above-mentioned problem, the dissimilar material joint structure according to claim 1 constitutes a part of a door, constitutes a first member formed of a first metal and another part of the door. The second member is disposed opposite to the first member and formed of a second metal having a natural potential different from that of the first metal, and the second member of the first member is opposed to the second member. A joining seat surface portion formed so as to bulge to the second member side, and a bulging end portion directly joined to a portion of the second member facing the first member by a joining means; and the first member And a seal member sandwiched between the opposing portions of the second member so as to surround the joint seat surface portion, and having a space between the joint seat surface portion and having electrical insulation. It is characterized by that.

  Thus, in the dissimilar material joint structure according to claim 1, the joint seat surface portion that bulges toward the second member is formed at the portion of the first member facing the second member. Therefore, it is possible to maintain the end portion of one facing portion of the first member and the second member in a state of being reliably floated from the other facing portion by the joint seat surface portion. Thereby, even if one of the first member and the second member is formed of a base metal having a high ionization tendency, the other facing portion of the end portion of one facing portion of the first member and the second member. Therefore, it is possible to prevent electrolytic corrosion from occurring at this end.

  Further, in the dissimilar material joining structure according to claim 1, since the sealing member having electrical insulation is sandwiched between the facing portions of the first member and the second member, the support force exerted by the entire sealing member is used. In addition, the end portion of one of the first member and the second member is maintained in a state of floating from the other facing portion.

  Furthermore, in the dissimilar material joint structure according to claim 1, since the seal member is sandwiched between the facing portions of the first member and the second member so as to surround the joint seat surface portion, It is possible to prevent water from entering the joint with the facing portion of the member. Thereby, the electric corrosion of a junction part can also be prevented.

  The dissimilar material joint structure according to claim 2 is the dissimilar material joint structure according to claim 1, wherein the seal member is more than an end portion of at least one of the opposing portions of the first member and the second member. A protruding portion that protrudes on the opposite side to the joint seat surface portion is formed.

  Thus, in the dissimilar material joint structure according to claim 2, the seal member has a protruding portion that protrudes on the side opposite to the bonding seat surface portion from the end portion of at least one of the first member and the second member. Is formed. Therefore, by forming the protruding portion on the seal member, a recess that opens to the opposite side of the joint seat surface portion is not formed between the facing portions of the first member and the second member. Thereby, since it becomes difficult for water to accumulate between the opposing parts of a 1st member and a 2nd member, the penetration | invasion of the water to the junction part of a joining seat surface part and the opposing part of a 2nd member can be prevented more reliably.

  Moreover, when the protrusion part of a sealing member protrudes on the opposite side to a joining seat surface part rather than the edge part of at least one opposing part of a 1st member and a 2nd member, the whole sealing member including this protrusion part exhibits. Due to the support force, the end portion of one of the first member and the second member is more reliably maintained in a state of floating from the other facing portion.

  The dissimilar material joint structure according to claim 3 is the dissimilar material joint structure according to claim 2, wherein the projecting portion has the first member and the dissimilar material surface from the projecting end portion side toward the joint seat surface portion side. An inclined surface that is inclined toward the end of the opposing portion of at least one of the second members is formed.

As described above, in the dissimilar material joint structure according to claim 3, the projecting portion moves toward the end portion side of at least one of the first member and the second member from the projecting end portion side toward the joint seat surface portion side. An inclined surface that is inclined is formed. Accordingly, the water flowing from the protruding end side is guided along the inclined surface to the end portion side of the facing portion, and is discharged outside the facing portions of the first member and the second member. Thereby, it becomes difficult to collect water between the opposing parts of a 1st member and a 2nd member.
Furthermore, as in the dissimilar material joining structure according to claim 4, it is more preferable that the joining means is spot welding or rivet fastening.

  As described above in detail, according to the dissimilar material joint structure of the present invention, it is possible to prevent the occurrence of electrolytic corrosion in the dissimilar material joint structure that joins members formed of dissimilar metals having a natural potential difference. Become.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that members, arrangements, and the like described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

  The dissimilar material joining structure 10 according to an embodiment of the present invention is suitably used for joining panel members constituting a door 12 of a vehicle such as a passenger car, for example. Hereinafter, an example in which the panel members constituting the vehicle door 12 are joined to each other by the dissimilar material joining structure 10 will be described with reference to FIGS.

(Join between beltline inner reinforcement 14 and door inner panel 16)
In the door 12 according to an embodiment of the present invention, as shown in FIG. 2 which is a cross-sectional view taken along the line AA of FIG. 1 and FIG. A beltline inner reinforcement 14 as a member is joined to a door inner panel 16 as a second member.

  In other words, the belt line inner reinforcement 14 is disposed opposite to the outer side of the door inner panel 16 in the vehicle width direction. The belt line inner reinforcement 14 is formed of a base metal such as aluminum, and the door inner panel 16 is formed of a noble metal such as iron.

  A joint seat surface portion 18 that bulges toward the door inner panel 16 side is formed in the facing portion 14 </ b> A of the belt line inner reinforcement 14 facing the door inner panel 16. The bulging end portion of the joint seat surface portion 18 is joined to a facing portion 16A of the door inner panel 16 facing the belt line inner reinforcement 14 by a joining means such as spot welding.

  Further, an annular seal member 20 is sandwiched between the facing portions 14A and 16A of the beltline inner reinforcement 14 and the door inner panel 16 so as to surround the joint seat surface portion 18. The seal member 20 is made of a member having electrical insulation such as a resin washer or a spacer, for example.

(Function)
Thus, in the dissimilar material joining structure 10 of this embodiment, the joining seat surface part 18 which bulges to the door inner panel 16 side is formed in the facing part 14A of the belt line inner reinforcement 14 with the door inner panel 16. . Therefore, the end 14B of the facing portion 14A of the beltline inner reinforcement 14 can be reliably maintained in a state of floating from the facing portion 16A of the door inner panel 16 by the joint seat surface portion 18. Thereby, even if the beltline inner reinforcement 14 is formed of a base metal having a high ionization tendency, the end portion 14B of the facing portion 14A of the beltline inner reinforcement 14 is connected to the facing portion 16A of the door inner panel 16. Since contact can be prevented, it is possible to prevent electrolytic corrosion from occurring at the end portion 14B.

  Moreover, in the dissimilar material joining structure 10 of this embodiment, since the sealing member 20 which has electrical insulation is pinched | interposed between the opposing parts 14A and 16A of the beltline inner reinforcement 14 and the door inner panel 16, this sealing member The end portion 14B of the facing portion 14A of the beltline inner reinforcement 14 is maintained in a state of being lifted from the facing portion 16A of the door inner panel 16 by the support force exerted by the entire belt 20, thereby preventing the occurrence of electrolytic corrosion at the end portion 14B. Is done.

  Furthermore, in the dissimilar material joining structure 10 of the present embodiment, the seal member 20 is sandwiched between the beltline inner reinforcement 14 and the facing portions 14A and 16A of the door inner panel 16 so as to surround the joining seat surface portion 18. Therefore, it is possible to prevent water from entering the joint portion 22 between the joint seat surface portion 18 and the facing portion 16A of the door inner panel 16. Thereby, the electric corrosion of the junction part 22 can also be prevented.

  Further, according to the dissimilar material joining structure 10 of the present embodiment, by forming the joining seat surface portion 18 at the facing portion 14A of the beltline inner reinforcement 14, the rigidity of the beltline inner reinforcement 14 itself is improved. As a result, the rigidity of the door inner panel 16 can be improved.

  Further, according to the dissimilar material joint structure 10 of the present embodiment, the joint seat surface portion 18 is formed on the facing portion 14A of the beltline inner reinforcement 14 so that the seal member 20 can be attached and used with the joint seat surface portion 18 as a reference. Since spot welding or rivet fastening can be performed, the workability of assembling the beltline inner reinforcement 14 to the door inner panel 16 is also improved.

  Furthermore, according to the dissimilar material joining structure 10 of the present embodiment, the dissimilar materials can be joined to the beltline inner reinforcement 14 and the door inner panel 16, so that the usage suitable for each material characteristic can be achieved. Thus, the weight reduction of the beltline inner reinforcement 14 and the door inner panel 16 can be achieved.

(Join the front extension 24 and the door inner panel 16)
In the door 12 according to an embodiment of the present invention, as shown in FIG. 3 which is a cross-sectional view taken along the line BB in FIGS. A front extension 24 as a member is joined to a door inner panel 16 as a second member.

  That is, the door inner panel 16 is provided inside the door outer panel 64, and the front extension 24 that fixes the front end side of the impact beam 26 is opposed to the outer side of the door inner panel 16 in the vehicle width direction. Has been placed. The front extension 24 is formed of a base metal such as aluminum, and the door inner panel 16 is formed of a noble metal such as iron as described above.

  A pair of joint seat surfaces 28 and 30 that bulge toward the door inner panel 16 are formed at positions facing the door inner panel 16 of the front extension 24 at positions spaced apart in the vertical direction. Further, an impact beam fixing portion 32 is formed on the facing portion 24A of the front extension 24 so as to fix the impact beam 26 so as to be wrapped (clamped) in the circumferential direction between the joint seat surface portions 28, 30. The front end side of the impact beam 26 is fixed to the impact beam fixing portion 32.

  On the other hand, on the facing portion 16A of the door inner panel 16 facing the front extension 24, bulging joint portions 34 and 36 that bulge toward the front extension 24 are formed at positions corresponding to the joint seat surface portions 28 and 30. The bulging end portions of the joint seat surface portions 28 and 30 of the front extension 24 are respectively joined to the bulging joint portions 34 and 36 formed on the facing portion 16A of the door inner panel 16 by a joining means such as spot welding. ing.

  Further, annular seal members 38 and 40 are sandwiched between the front extension 24 and the facing portions 24A and 16A of the door inner panel 16 so as to surround the joint seat surface portions 28 and 30 and the bulging joint portions 34 and 36, respectively. It is. The seal members 38 and 40 are made of an electrically insulating member such as a resin washer or a spacer, for example.

(Function)
As described above, in the dissimilar material joint structure 10 of the present embodiment, the joint seat surface portions 28 and 30 that bulge toward the door inner panel 16 are formed on the facing portion 24A of the front extension 24 facing the door inner panel 16. Therefore, the end portions 24B and 24C of the facing portion 24A of the front extension 24 can be reliably maintained from the facing portion 16A of the door inner panel 16 by the joint seat surface portions 28 and 30. Thereby, even if the front side extension 24 is formed of a base metal having a high ionization tendency, it is possible to prevent the end portions 24B and 24C of the facing portion 24A of the front side extension 24 from contacting the facing portion 16A of the door inner panel 16. Therefore, it is possible to prevent electrolytic corrosion from occurring at the end portions 24B and 24C.

  Further, in the dissimilar material joint structure 10 of the present embodiment, since the sealing members 38, 40 having electrical insulation are sandwiched between the front extension 24 and the facing portions 24A, 16A of the door inner panel 16, the sealing member 38 40, the end portions 24B and 24C of the facing portion 24A of the front extension 24 are kept floating from the facing portion 16A of the door inner panel 16 by the supporting force exerted by the entire front extension 24, and electric corrosion of the end portions 24B and 24C is generated. Is prevented.

  Further, in the dissimilar material joint structure 10 of the present embodiment, the seal members 38 and 40 are sandwiched between the front extension 24 and the facing portions 24A and 16A of the door inner panel 16 so as to surround the joint seat surface portions 28 and 30. Therefore, it is possible to prevent water from entering the joint portions 42 and 43 between the joint seat surface portions 28 and 30 and the facing portion 16A of the door inner panel 16. Thereby, the electric corrosion of the junction parts 42 and 43 can also be prevented.

  Further, according to the dissimilar material joining structure 10 of the present embodiment, the joining seat surface portions 28 and 30 are formed on the facing portion 24A of the front extension 24, thereby improving the rigidity of the front extension 24 itself, and as a result, the door inner panel. The support rigidity of the front end side of the impact beam 26 with respect to 16 can also be improved.

  Further, according to the dissimilar material joining structure 10 of the present embodiment, the joining seat surface portions 28 and 30 are formed on the facing portion 24A of the front extension 24, and the sealing members 38 and 40 are based on the joining seat surface portions 28 and 30. Mounting, spot welding, rivet fastening, and the like can be performed, so that the workability of assembling the front extension 24 to the door inner panel 16 is also improved.

  Further, according to the dissimilar material joining structure 10 of the present embodiment, since the dissimilar materials can be joined to the front extension 24 and the door inner panel 16, they can be used in accordance with the respective material characteristics. As a result, the front extension 24 and the door inner panel 16 can be reduced in weight.

  In addition, in the dissimilar-material joining structure 10 of this embodiment, it can deform | transform as FIG. 4 shows. That is, the connection support portion 17 connected to the impact beam fixing portion 32 via the adhesive 33 may be provided at a portion where the impact beam fixing portion 32 of the door inner panel 16 is located. Further, the door outer panel 64 side of the impact beam 26 may be connected to the door outer panel 64 via an adhesive 27. In this way, the support rigidity and strength of the impact beam 26 can be improved.

(Join the rear extension 44 and the door inner panel 16)
In the door 12 according to an embodiment of the present invention, as shown in FIG. 5 which is a cross-sectional view taken along the line C-C of FIGS. A rear extension 44 as a member is joined to the door inner panel 16 as a second member.

  That is, the rear extension 44 that fixes the rear end side of the impact beam 26 is disposed opposite to the vehicle inner side in the vehicle width direction of the door inner panel 16 provided inside the door outer panel 64. The rear extension 44 is formed of a base metal such as aluminum, and the door inner panel 16 is formed of a noble metal such as iron as described above.

  A pair of joint seat surfaces 48 and 50 that bulge toward the door inner panel 16 are formed in a portion 44A facing the door inner panel 16 of the rear extension 44 at positions spaced apart in the vertical direction. Further, an impact beam fixing portion 52 is formed on the facing portion 44A of the rear extension 44 so as to wrap the impact beam 26 in the circumferential direction between the joint seat surface portions 48 and 50 (to hold it). The rear end side of the impact beam 26 is fixed to the impact beam fixing portion 52.

  On the other hand, on the facing portion 16A facing the rear extension 44 of the door inner panel 16, bulging joint portions 54 and 56 bulging toward the rear extension 44 are formed at positions corresponding to the joint seat surface portions 48 and 50. Yes. The bulging end portions of the joint seat surface portions 48 and 50 of the rear extension 44 are respectively joined to the bulging joint portions 54 and 56 formed on the facing portion 16A of the door inner panel 16 by a joining means such as spot welding. Has been.

  Between the rear extension 44 and the facing portions 44A and 16A of the door inner panel 16, annular seal members 58 and 60 are provided so as to surround the joint seat surface portions 48 and 50 and the bulging joint portions 54 and 56, respectively. It is sandwiched. The seal members 58 and 60 are made of an electrically insulating member such as a resin washer or a spacer, for example.

(Function)
As described above, in the dissimilar material joint structure 10 of the present embodiment, the joint seat surface portions 48 and 50 that bulge toward the door inner panel 16 are formed on the portion 44A of the rear extension 44 facing the door inner panel 16. . Therefore, the end portions 44B and 44C of the facing portion 44A of the rear extension 44 can be reliably maintained in a state of floating from the facing portion 16A of the door inner panel 16 by the joint seat surface portions 48 and 50. As a result, even if the rear extension 44 is formed of a base metal having a high ionization tendency, the end portions 44B and 44C of the opposing portion 44A of the rear extension 44 are brought into contact with the opposing portion 16A of the door inner panel 16. Since it can prevent, electrolytic corrosion can be prevented from occurring at the end portions 44B and 44C.

  Moreover, in the dissimilar material joining structure 10 of this embodiment, since the sealing members 58 and 60 which have electrical insulation are pinched | interposed between the opposing part 44A and 16A of the rear side extension 44 and the door inner panel 16, this sealing member The end portions 44B and 44C of the facing portion 44A of the rear extension 44 are also maintained in a state of being lifted from the facing portion 16A of the door inner panel 16 by the supporting force exerted by the whole 58 and 60, and the electrolytic corrosion of the end portions 44B and 44C is maintained. Is prevented from occurring.

  Further, in the dissimilar material joint structure 10 of the present embodiment, the seal members 58 and 60 are sandwiched between the rear extension 44 and the facing portions 44A and 16A of the door inner panel 16 so as to surround the joint seat surface portions 48 and 50. Therefore, it is possible to prevent water from entering the joint portions 62 and 63 between the joint seat surface portions 48 and 50 and the facing portion 16A of the door inner panel 16. Thereby, the electric corrosion of the junction parts 62 and 63 can also be prevented.

  Further, according to the dissimilar material joint structure 10 of the present embodiment, the rigidity of the rear extension 44 itself is improved by forming the joint seat surface portions 48 and 50 in the facing portion 44A of the rear extension 44, and as a result, the door The support rigidity of the rear end side of the impact beam 26 with respect to the inner panel 16 can also be improved.

  Further, according to the dissimilar material joint structure 10 of the present embodiment, by forming the joint seat surface portions 48, 50 in the facing portion 44A of the rear extension 44, the seal members 58, 50 are defined based on the joint seat surface portions 48, 50. Since attachment of 60, spot welding, rivet fastening, etc. can be performed, the workability of assembling the rear extension 44 to the door inner panel 16 is also improved.

  Furthermore, according to the dissimilar material joining structure 10 of the present embodiment, these can be joined using dissimilar materials to the rear extension 44 and the door inner panel 16, so that it can be used in accordance with the respective material characteristics, Thereby, it is possible to reduce the weight of the rear extension 44 and the door inner panel 16.

(Joining of door frame bracket 66 and door inner panel 16)
In the door 12 according to an embodiment of the present invention, as shown in FIG. 6 which is a cross-sectional view taken along the line DD of FIGS. A door frame bracket 66 as a member is joined to a door inner panel 16 as a second member.

  That is, the door frame bracket 66 that fixes the rear end side of the door frame 68 is disposed opposite to the vehicle width direction outer side of the door inner panel 16 provided inside the door outer panel 64. The door frame bracket 66 is formed of a base metal such as aluminum, and the door inner panel 16 is formed of a noble metal such as iron as described above.

  A joint seat surface portion 70 that bulges toward the door inner panel 16 is formed at a portion 66A of the door frame bracket 66 that faces the door inner panel 16. In addition, a door frame fixing portion 72 extending outward in the vehicle width direction is formed on a portion 66A of the door frame bracket 66 facing the door inner panel 16. The door frame fixing portion 72 includes a door frame 68. The rear end side is fixed.

  The bulging end portion of the joint seat surface portion 70 of the door frame bracket 66 is joined to the facing portion 16A of the door inner panel 16 by a joining means such as spot welding.

  An annular seal member 74 is sandwiched between the door frame bracket 66 and the facing portions 66 </ b> A and 16 </ b> A of the door inner panel 16 so as to surround the joint seat surface portion 70. The seal member 74 is formed of a member having electrical insulation properties such as a resin washer and a spacer, for example.

(Function)
As described above, in the dissimilar material joint structure 10 of the present embodiment, the joint seat surface portion 70 that bulges toward the door inner panel 16 is formed in the facing portion 66A of the door frame bracket 66 facing the door inner panel 16. Therefore, the end portion 66B of the facing portion 66A of the door frame bracket 66 can be reliably maintained in a state of floating from the facing portion 16A of the door inner panel 16 by the joint seat surface portion 70. Thereby, even if the door frame bracket 66 is formed of a base metal having a high ionization tendency, the contact of the end portion 66B of the facing portion 66A of the door frame bracket 66 with the facing portion 16A of the door inner panel 16 can be prevented. Therefore, it is possible to prevent electrolytic corrosion from occurring at the end portion 66B.

  Moreover, in the dissimilar material joining structure 10 of this embodiment, since the sealing member 74 which has electrical insulation is pinched | interposed between the facing parts 66A and 16A of the door frame bracket 66 and the door inner panel 16, this sealing member 74 whole The end portion 66B of the facing portion 66A of the door frame bracket 66 is also maintained in a state of being lifted from the facing portion 16A of the door inner panel 16 by the supporting force exerted by the above, and the occurrence of electrolytic corrosion at the end portion is prevented.

  Furthermore, in the dissimilar material joint structure 10 of the present embodiment, the seal member 74 is sandwiched between the door frame bracket 66 and the facing portions 66A and 16A of the door inner panel 16 so as to surround the joint seat surface portion 70. It is possible to prevent water from entering the joint portion 76 between the joint seat surface portion 70 and the facing portion 16A of the door inner panel 16. Thereby, the electrolytic corrosion of the junction part 76 can also be prevented.

  Further, according to the dissimilar material joining structure 10 of the present embodiment, the joint seat surface portion 70 is formed on the facing portion 66A of the door frame bracket 66, thereby improving the rigidity of the door frame bracket 66 itself, and as a result, the door inner panel. The support rigidity of the door frame 68 with respect to 16 can also be improved.

  Further, according to the dissimilar material joint structure 10 of the present embodiment, the joint seat surface portion 70 is formed in the facing portion 66A of the door frame bracket 66, so that the seal member 74 can be attached or spot welded with the joint seat surface portion 70 as a reference. Alternatively, since rivets can be fastened, the workability of assembling the door frame bracket 66 to the door inner panel 16 is improved.

  Furthermore, according to the dissimilar material joining structure 10 of the present embodiment, these can be joined to the door frame bracket 66 and the door inner panel 16 using dissimilar materials. Thereby, it is possible to reduce the weight of the door frame bracket 66 and the door inner panel 16.

(Joint of lock reinforcement 78 and door inner panel 16)
In the door 12 according to an embodiment of the present invention, as shown in FIG. 7 which is a cross-sectional view taken along the line EE of FIGS. 1 and 1, the first structure is formed by the dissimilar material joint structure 10 according to the embodiment of the present invention. A lock reinforcement 78 as a member is joined to the door inner panel 16 as a second member.

  That is, the lock reinforcement 78 is disposed opposite to the vehicle inner side in the vehicle width direction of the door inner panel 16 provided inside the door outer panel 64. The lock reinforcement 78 is formed of a base metal such as aluminum, and the door inner panel 16 is formed of a noble metal such as iron as described above.

  A joint seat surface portion 80 that bulges toward the door inner panel 16 is formed at a portion 78A of the lock reinforcement 78 facing the door inner panel 16. Further, the bulging end portion of the joint seat surface portion 80 of the lock reinforcement 78 is joined to the facing portion 16A of the door inner panel 16 by a joining means such as spot welding.

  An annular seal member 82 is sandwiched between the lock reinforcement 78 and the facing portions 78A and 16A of the door inner panel 16 so as to surround the joint seat surface portion 80. The seal member 82 is made of an electrically insulating member such as a resin washer or spacer.

(Function)
As described above, in the dissimilar material joint structure 10 according to the present embodiment, the joint seat surface portion 80 that bulges toward the door inner panel 16 is formed in the facing portion 78A of the lock reinforcement 78 facing the door inner panel 16. Therefore, the end portion 78B of the facing portion 78A of the lock reinforcement 78 can be reliably maintained in a state of floating from the facing portion 16A of the door inner panel 16 by the joint seat surface portion 80. Thereby, even if the lock reinforcement 78 is formed of a base metal having a high ionization tendency, the contact of the end portion 78B of the facing portion 78A of the lock reinforcement 78 with the facing portion 16A of the door inner panel 16 can be prevented. Therefore, it is possible to prevent electrolytic corrosion from occurring at the end portion 78B.

  Further, in the dissimilar material joint structure 10 of the present embodiment, since the seal member 82 having electrical insulation is sandwiched between the lock reinforcement 78 and the facing portions 78A, 16A of the door inner panel 16, the entire seal member 82 is disposed. Also, the end portion 78B of the facing portion 78A of the lock reinforcement 78 is maintained in a state of being lifted from the facing portion 16A of the door inner panel 16 by the supporting force exerted by this, and the occurrence of electrolytic corrosion at the end portion is prevented.

  Furthermore, in the dissimilar material joint structure 10 of the present embodiment, the seal member 82 is sandwiched between the lock reinforcement 78 and the facing portions 78A and 16A of the door inner panel 16 so as to surround the joint seat surface portion 80. It is possible to prevent water from entering the joint portion 84 between the joint seat surface portion 80 and the facing portion 16A of the door inner panel 16. Thereby, the electrolytic corrosion of the joining part 84 can also be prevented.

  Further, according to the dissimilar material joint structure 10 of the present embodiment, by forming the joint seat surface portion 80 at the facing portion 78A of the lock reinforcement 78, the rigidity of the lock reinforcement 78 itself is improved. The mounting rigidity of the portion (latch and striker) can also be improved.

  Further, according to the dissimilar material joint structure 10 of the present embodiment, the joint seat surface portion 80 is formed in the facing portion 78A of the lock reinforcement 78, whereby the seal member 82 is attached or spot welded with the joint seat surface portion 80 as a reference. Alternatively, since rivets can be fastened, the workability of assembling the lock reinforcement 78 to the door inner panel 16 is improved.

  Furthermore, according to the dissimilar material joining structure 10 of the present embodiment, these can be joined to the lock reinforcement 78 and the door inner panel 16 using dissimilar materials, so that it can be used according to the respective material characteristics, This makes it possible to reduce the weight of the lock reinforcement 78 and the door inner panel 16.

  Next, a modified example of the dissimilar material joint structure 10 of the present embodiment will be described.

  In the said embodiment, although demonstrated by taking as an example the joining of each panel material which comprises the door 12 of vehicles, such as a passenger car, the dissimilar-material joining structure 10 which concerns on one Embodiment of this invention has other different natural potential. Of course, it may be used for joining different metal members.

  In the above embodiment, for example, the belt seat inner reinforcement 14, the front extension 24, the rear extension 44, the door frame bracket 66, and the lock reinforcement 78 are used as the first members to form the joint seat surface portion, and the door inner panel 16 is the second member, but the door inner panel 16 is the first member, and a joint seat surface portion is formed thereon, and the beltline inner reinforcement 14, the front extension 24, the rear extension 44, the door frame bracket 66, the lock reinforcement The ment 78 may be the second member.

  In the above embodiment, for example, the belt line inner reinforcement 14, the front extension 24, the rear extension 44, the door frame bracket 66, and the lock reinforcement 78 as the first member are formed of a base metal (for example, aluminum). In the above description, the door inner panel 16 as the second member is formed of a noble metal (for example, iron), but the belt line inner reinforcement 14, the front extension 24, the rear extension 44, and the door as the first member. The frame bracket 66 and the lock reinforcement 78 may be made of a noble metal, and the door inner panel 16 as the second member may be made of a base metal.

Moreover, in the said embodiment, it demonstrates so that the bulging end part of the joint seat surface part 28 may be joined to the opposing part 14A with the beltline inner reinforcement 14 of the door inner panel 16 by joining means, such as spot welding, for example. However, in addition, for example, as shown in FIG. 8, a joining seat surface portion 90 formed so as to bulge toward the second member 88 side at the facing portion 86 </ b> A of the first member 86 with respect to the second member 88. The bulging end portion of the second member 88 may be joined to the facing portion 88 </ b> A of the second member 88 facing the first member 86 by fastening with a rivet 92.

  Thus, even if the bulging end portion of the joint seat surface portion 90 is fastened by the rivet 92 to the facing portion 88A of the second member 88 with respect to the first member 86, the water falling along the second member 88 is dropped. Since it falls down along the outer peripheral surface of the seal member 96, it is difficult for water to collect between the facing portions 86A and 88A of the first member 86 facing the second member 88. Thereby, the electric corrosion of the rivet joint surface 98 can be prevented.

  In this case, as shown in FIG. 9, a bulge that bulges toward the first member 86 at a position corresponding to the joint seat surface portion 90 at a portion 86A of the second member 88 facing the first member 86. The joint portion 100 may be formed, and the bulging end portion of the joint seat surface portion 90 may be joined to the bulging joint portion 100.

  Further, as shown in FIG. 10, the bulging joint portion 100 is in a bulging direction of the joint seat surface portion 90 at a position corresponding to the joint seat surface portion 90 at the facing portion 88A of the second member 88 with respect to the first member 86. It may be formed so as to bulge in the same direction.

  Further, as shown in FIG. 11, even if one side of the inner peripheral surface of the seal member 96 is chamfered in accordance with the inclined surface 90 </ b> A of the joint seat surface portion 90 and is in close contact with the inclined surface 90 </ b> A of the joint seat surface portion 90. good.

  Further, as shown in FIG. 12A, the seal member 96 is formed with a protruding portion 96 </ b> A that protrudes to the opposite side of the joint seat surface portion 90 from the end portion 86 </ b> B of the facing portion 86 </ b> A of the first member 86. A step H (that is, the outer dimension of the seal member 96 is the outer dimension of the joint seat surface part 90) between the projecting end part (the outer peripheral surface of the seal member 96) of the projecting part 96A and the end part 86B of the opposing part 86A of the first member 86. Larger) may be provided.

  Here, if the projecting portion 96A is omitted from the seal member 96, the end portion 86B of the facing portion 86A of the first member 86 is more than the end portion of the seal member 96 as shown in FIG. Therefore, a recess 102 is formed between the facing portions 86A and 88A of the first member 86 and the second member 88 so as to open on the opposite side to the joint seat surface portion 90. Accordingly, water accumulates in the recess 102.

  However, as shown in FIG. 12A, a protruding portion 96 </ b> A that protrudes to the opposite side of the joint seat surface portion 90 from the end portion 86 </ b> B of the opposing portion 86 </ b> A of the first member 86 is formed. If a step H is provided between the end portion 86B of the portion 86A, water does not easily accumulate between the facing portions 86A and 88A of the first member 86 and the second member 88. It is possible to more reliably prevent water from entering the rivet joint surface 98 (joint portion) between the seat surface portion 90 and the facing portion 88A of the second member 88. Thereby, the electric corrosion of the rivet joint surface 98 can be prevented more reliably.

  Further, the projecting portion 96A of the seal member 96 projects to the opposite side of the joint seat surface portion 90 from the end portion 86B of the facing portion 86A of the first member 86, whereby the entire seal member 96 including the projecting portion 96A is exhibited. Due to the supporting force, the end portion 86B of the facing portion 86A of the first member 86 is more reliably maintained in a state of floating from the facing portion 88A of the second member 88. Thereby, generation | occurrence | production of the electric corrosion of the edge part 86B can be prevented more reliably.

  Further, by forming the protruding portion 96A on the seal member 96, the protruding portion 96A protrudes from the end portion 86B and is visually recognized from the outside. Therefore, in the assembling process, the opposing portions 86A, 86A, 86A, It is possible to easily confirm that the seal member 96 is inserted between 88A. Thereby, productivity can be improved.

  In this case, the projecting portion 96A may project to the opposite side of the joint seat surface portion 90 from the end portion (not shown) of the facing portion 88A of the second member 88, and the facing portion 86A of the first member 86. The end portion 86 </ b> B of the second member 88 and the end portion of the facing portion 88 </ b> A of the second member 88 may protrude beyond the joint seat surface portion 90.

  As shown in FIGS. 13 and 14, the projecting portion 96 </ b> A has an inclined surface that inclines toward the end portion 86 </ b> B side of the facing portion 86 </ b> A of the first member 86 from the projecting end portion side toward the joint seat surface portion 90 side. 96B may be formed. The inclined surface 96B may be linear (chamfered) as shown in FIG. 13, or may be arcuate as shown in FIG. Further, a combination of straight lines and curves may be used.

  According to this configuration, as shown in FIGS. 13 and 14, the water flowing from the projecting end portion side is guided along the inclined surface 96B to the end portion 86B side of the facing portion 86A, and the first member 86 and The second member 88 is discharged between the opposing portions 86A and 88A. Thereby, since it becomes more difficult for water to accumulate between the opposing parts 86A and 88A of the first member 86 and the second member 88, it is possible to more reliably prevent water from entering the rivet joint surface 98 (joint part).

FIG. 1 is a side view showing a configuration of a door to which a dissimilar material joining structure according to an embodiment of the present invention is applied. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a cross-sectional view showing a first modification of the dissimilar material joint structure according to one embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line CC of FIG. 6 is a cross-sectional view taken along the line DD of FIG. FIG. 7 is a cross-sectional view taken along line EE in FIG. FIG. 8 is a cross-sectional view showing a second modification of the dissimilar material joint structure according to one embodiment of the present invention. FIG. 9 is a cross-sectional view showing a third modification of the dissimilar material joint structure according to one embodiment of the present invention. FIG. 10 is a cross-sectional view showing a fourth modification of the dissimilar material joint structure according to one embodiment of the present invention. FIG. 11 is a cross-sectional view showing a fifth modification of the dissimilar material joint structure according to one embodiment of the present invention. FIG. 12A is a sectional view showing a sixth modification of the dissimilar material joint structure according to one embodiment of the present invention, and FIG. 12B is a view showing a comparative example. FIG. 13 is a cross-sectional view showing a seventh modification of the dissimilar material joint structure according to one embodiment of the present invention. FIG. 14 is a cross-sectional view showing an eighth modification of the dissimilar material joint structure according to one embodiment of the present invention.

Explanation of symbols

10 Dissimilar material joint structure 14 Beltline inner reinforcement (first member)
16 Door inner panel (second member)
18, 28, 30, 48, 50, 70, 80, 90 Joint seat surface portion 20, 38, 40, 58, 60, 74, 82, 96 Seal member 24 Front extension (first member)
44 Rear extension (first member)
66 Door frame bracket (first member)
78 Lock reinforcement (first member)
86 First member 88 Second member

Claims (4)

Constituting a part of the door, a first member formed of a first metal;
A second member formed of a second metal that constitutes another part of the door, is disposed opposite to the first member, and has a natural potential different from that of the first metal;
The first member is formed so as to bulge toward the second member at the portion facing the second member, and the bulging end portion is joined to the portion facing the first member of the second member. A joint seat surface part joined directly by means;
The sealing member is sandwiched between the opposing portions of the first member and the second member so as to surround the joint seat surface portion, and has a space between the joint seat surface portion and has an electrical insulating property. When,
A dissimilar material joint structure characterized by comprising:   The protruding portion that protrudes on the opposite side of the joint seat surface portion from the end portion of at least one of the first member and the second member is formed on the seal member. 2. The dissimilar material joint structure according to 1.   The projecting portion is formed with an inclined surface that inclines toward the end portion of at least one of the first member and the second member from the projecting end portion side toward the joint seat surface portion side. The dissimilar material joint structure according to claim 2. The joining means is spot welding or rivet fastening,
  The dissimilar-material joining structure as described in any one of Claims 1-3.

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